Analysis of the super-sensitivity of N00N and M−and−M′ states under atmospheric influence

Xu, Shilong; Hu, Yihua; Zhao, Nanxiang; Li, Le; Zhao, Xinying

doi:10.1117/12.2202932

Cited by 1 publication

(1 citation statement)

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“…Perhaps because young individuals only require few environmental resources for growth and development and only face mild interspecific and intraspecific competition, the presence of a large number of young individuals can be maintained. With increasing tree age, the individual numbers of the two Rhododendron populations decrease rapidly, mainly because of resource limitations as well as self-thinning and allelopathic effects [26,28,29]. Faced with intensified interspecific and intraspecific competition, the individual numbers of both populations experience a gradual decline.…”

Section: Population Structures and Typesmentioning

confidence: 99%

Population Structures and Dynamics of Rhododendron Communities with Different Stages of Succession in Northwest Guizhou, China

Zhang,

Wang,

Wang

et al. 2024

Plants

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To explore the population structures and dynamics of Rhododendron shrub communities at different stages of succession in northwest Guizhou, China, this study examined the populations of Rhododendron annae and Rhododendron irroratum shrub with two different stages. A space-for-time substitution was employed to establish the diameter class/height structures, static life tables, and survival/mortality rate/disappearance rate curves of both Rhododendron populations with different orders of succession. Their structural and quantitative dynamics were analyzed, and their development trends were predicted. The results showed that, quantitatively, the populations of R. annae and R. irroratum in the two Rhododendron communities with different orders of succession were dominated by age classes one, two, and three as well as height classes i, ii, and iii. The number of Rhododendron plants at the three age classes and the three height classes accounted for 97.61–100% of the total. The quantitative dynamic indices of R. annae and R. irroratum were both greater than 0, with and without considering external interference. In terms of age class and height structures, both Rhododendron populations were expanding populations, presenting “inverted-J-shaped” and irregular pyramid patterns. There was a sufficient number of young individuals, but few or no old individuals. Both survival curves of the populations of R. annae and R. irroratum in the two Rhododendron communities with different orders of succession belonged to the Deevy-II type. In the late stage of succession, the mortality curves and disappearance curves of both Rhododendron populations in these communities presented a trend of increasing first and then decreasing with increasing age class. This result indicates that at each age class, R. annae and R. irroratum showed a trend of gradual increase after two, four, and six years. In brief, the populations of R. annae and R. irroratum have rich reserves of seedlings and saplings, but high mortality and disappearance rates. In this context, it is necessary to reduce human interference and implement targeted conservation measures to promote the natural renewal of Rhododendron populations.

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Section: Population Structures and Typesmentioning

confidence: 99%